Understanding and relations issues from caricatures to protests, what and why draw ires?

http://www.albawaba.com/editorchoice/qatar-angry-hundreds-march-doha-against-chapel-hill-shootings-65

FBI probes Detroit-area stabbings where Muslim suspect reportedly asked victims' faith

But Muslim advocates cautioned against ascribing a religious motive to the attack without more evidence.
"I don't think there should be a litmus test for crazy Muslims," said Dawud Walid, executive director of Council on American Islamic Relations. "Or as if all Muslims are motivated by religion."

Should the same caution apply to the chapel hill shooting perpetrator?